[petsc-users] Solve the Poisson equation twice with /src/ksp/ksp/examples/tutorials/ex45.c

[Zhenglun (Alan) Wei]

Dear All,
     I hope you're having a nice day.
     I was trying to solve the Poisson equation with 
/src/ksp/ksp/exmaples/tutorial/ex45.c; however, it always give me the 
same result. I recalled the PetscLogStages and resolved this problem. 
However, the process of reconstructing DM costs a lot of computational 
time. I wonder do I have to use PetscLogStages to solve this problem, 
since, I thought, this function is only needed for using DMMG. Or as 
long as DM twice in one program, then I need to call PetscLogStages.

thanks,
Alan